Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04_develop-c57

Commit: clea-os/layers/seco/meta-seco-imx@ec233574

Integrate u-boot-seco-imx/seco_lf_v2021.04_develop-c57

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Commit: clea-os/bsp/nxp/u-boot-seco-imx@883eebda

[C57][SECO-CONFIG] Add ramfs selection

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Commit: clea-os/bsp/nxp/u-boot-seco-imx@e28d1baa

[C57][FIX] Correct the device ID when booting from USB

The device ID (set into the U-Boot variables kernel_device_id and fdt_device_id) was incorrect and could not load correctly the kernel and the device tree from USB.

JIRA Reference: [CLEAOS-406]